so i have installed new brake pads on my bike, i broke them in like the paper said by riding slow and and letting the pads wear in, how ever after brake in period, it seem like after the pads get heated, i can press the foot break lever almost al the way down to the ground and it feels like the rear breaks just dont have pressure, befor i can lock up my rear tires while pressing the rear brakes and now it feel like i don have none, do i have to adjust something on the rear brake caliper, i see a long screw on the end of the caliper with a spring connecting to the frame, do i adjust that or something else, please help